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Radionuclide Dosimetric Data Sheets
Xenon-127m
Summary data
General
Classification
Isotope: Xe-127m
Atomic number (Z): 54
Mass number (A): 127
Neutron number (N): 73
Radioactive decay
Decay modes: Internal transition
Half-life: 69.2 [s]
Decay constant: 1.0017e-02 [1/s]
Daughters: Xe-127 (100.0%)
Radioactive daughters: Xe-127
Dosimetric constants
Mean alpha energy: 0.0 [MeV]
Mean electron energy: 0.12927 [MeV]
Mean photon energy: 0.16854 [MeV]
Air kerma rate constant, Γ10: 7.922e-18 [Gy·m2/Bq·s]
Air kerma coefficient, Kair: 7.922e-18 [Gy·m2/Bq·s]
Equilibrium dose constant for weakly-penetrating radiations (α and/or
electrons), Δwp: 2.071e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for alphas, Δα: 0.000e+00
[Gy·kg/Bq·s]
Equilibrium dose constant for betas/electrons, Δβ-,β+,e-:
2.071e-14 [Gy·kg/Bq·s]
Equilibrium dose constant for photons, Δp: 2.700e-14
[Gy·kg/Bq·s]
Dose point kernels (plot)
Dose point kernel source: Graves, et al. Medical Physics. 2019 Nov.; 46(11):5284-5293.
Note: Bins are spaced every 0.1 mm until a radius of 10 cm, and every 1 mm until a radius of 2 m.
Download tabulated dose point kernel file here: www.mirdsoft.org/products/MIRDspecs/Xe-127m DPK.csv
Summary spectra (plot)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Download tabulated summary spectra file here: www.mirdsoft.org/products/MIRDspecs/Xe-127m Summary Spectrum.csv
Tabulated data
Summary spectra (table)
Spectra source: ICRP Publication 107: Nuclear Decay Data for Dosimetric Calculations. Ann. ICRP 2008, 38 (3).
Note: Radiations with yield < 0.01 are excluded from the table, but are available in the linked *.csv data.
Download tabulated summary spectra file here: www.mirdsoft.org/products/MIRDspecs/Xe-127m Summary Spectrum.csv
|
Energy [MeV] |
Yield [#/nt] if > 0.01 |
Radiation type |
|
1.66155e-05 |
1.074e+01 |
X-ray |
|
4.09719e-03 |
3.365e-02 |
X-ray |
|
4.41300e-03 |
2.314e-02 |
X-ray |
|
2.94521e-02 |
1.565e-01 |
X-ray |
|
2.97812e-02 |
2.898e-01 |
X-ray |
|
3.35665e-02 |
2.720e-02 |
X-ray |
|
3.36295e-02 |
5.273e-02 |
X-ray |
|
3.44080e-02 |
1.112e-02 |
X-ray |
|
1.24600e-01 |
6.900e-01 |
Gamma |
|
1.72500e-01 |
3.795e-01 |
Gamma |
|
2.60838e-05 |
1.667e+00 |
Auger electron |
|
3.62283e-05 |
5.113e+00 |
Auger electron |
|
1.24625e-04 |
6.248e-01 |
Auger electron |
|
3.00012e-04 |
1.055e-01 |
Auger electron |
|
5.04856e-04 |
1.411e+00 |
Auger electron |
|
6.16367e-04 |
8.058e-02 |
Auger electron |
|
3.32534e-03 |
5.535e-01 |
Auger electron |
|
4.00172e-03 |
1.642e-01 |
Auger electron |
|
4.70443e-03 |
1.246e-02 |
Auger electron |
|
2.44715e-02 |
4.399e-02 |
Auger electron |
|
2.86854e-02 |
1.968e-02 |
Auger electron |
|
9.00440e-02 |
2.684e-01 |
Conversion electron |
|
1.19183e-01 |
3.251e-02 |
Conversion electron |
|
1.37944e-01 |
3.428e-01 |
Conversion electron |
|
1.67083e-01 |
3.270e-02 |
Conversion electron |
|
1.67396e-01 |
1.014e-01 |
Conversion electron |
|
1.67725e-01 |
8.506e-02 |
Conversion electron |
|
1.71573e-01 |
4.823e-02 |
Conversion electron |
|
1.72500e-01 |
1.133e-02 |
Conversion electron |
Useful Links
Isotope decay characteristics are periodically updated as better measurements can be made - changes that may not be reflected on this page. Please see useful links:
National Nuclear Data Center (NNDC): https://www.nndc.bnl.gov/nudat3/mird/
International Atomic Energy Agency (IAEA) Livechart: https://www-nds.iaea.org/relnsd/vcharthtml/VChartHTML.html
Reference Links
ICRP Report 107: https://www.icrp.org/publication.asp?id=ICRP%20Publication%20107
Graves et al. Dose Point Kernels: https://doi.org/10.1002/mp.13789
MIRD Decay Schemes 2nd Edition: https://sites.snmmi.org/SNMMI-MAIN/iCore/Store/StoreLayouts/Item_Detail.aspx?iProductCode=0-932004-80-6
MIRDsoft MIRDspecs version 20250101 (www.mirdsoft.org)
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